I don’t mind the new Big Sur look, don’t think it is particularly good looking but have no issue adapting to it. My biggest “gripe” is that application windows now are rounded so if you maximize it, the background desktop creates little square corners as it is still square (my wife tells me I am too detail oriented )
But I too have a spotty experience with Big Sur’s quality. Installed on:
2x MacBook Pro 16"
2x Mac mini 2014
5x Mac mini 2017 (or was it 2018)
1x MacBook Air 2013
1x MacBook Air M1
Still have a few Catalina and also High Sierra iMacs that no longer are upgradable.
Big Sur is all over the place for me; one of the MacBook 16" is slow sometimes, crashes a few times a week, spotlight daemon constantly crashes and I have a so-so experience connecting it to embedded firmware target I am building (USB to JTAG). Network experience with it both WiFi and wired are … rock solid. Go figure.
Second Mac book 16" has frequent connection problems to mail, calendar, Fusion360, Slack. Safari often does not load pages even though Chrome has no issues with the same page. Crashes with Pages sometimes or using Numbers.
All notebooks and one of the minis have bluetooth issues (some more than others) - i.e., dropping out frequently, need to reset to get it back.
A few minis work just fine (they are used mainly for hardware developments) But one of the later ones is just too slow to work with and cannot hold it together for more than a day before a crash. It is not connected to a network so no network failures (haha).
The M1 works without failures and is blazing…
With exception to the M1 MacBook Air, all were running Catalina before, mostly without issues. Big Sur today feels as if it was just released a few weeks ago. I don’t have the time to do a deep dive into the issues so just muddle along. Sometimes Apple makes a true improvement and sometimes we find a fix ourselves. All this is definitely making me gun shy for the next release.